For Valve, Morasky composed the music for Team Fortress 2, Left 4 Dead, Left 4 Dead 2 (including composing and playing the guitar, keyboard and bass for the fictional hard rock band "Midnight Riders"), Portal 2, and provided additional music for the original Portal.
Morasky was part of the now defunct hardcore punk/noise rock band "Steel Pole Bath Tub", which he founded in 1986 with Dale Flattum. S.P.B.T. disbanded in 2002.
On Valve's official website, his function is described as follows: "Morasky's life and career looks a lot like one of the post-modern audio collages he is so fond of creating. Guitar player in a full-time bar band in Montana as a teen, award winning experimental composer in Tokyo, audio hardware programmer in Silicon Valley, underground art rocker touring the world, 3d animator and director for television, electronic audio collage artist in France and Japan, visual fx artist on the Lord of the Rings and Matrix Trilogies, AI animation instructor at an art college and currently he is applying some combination of all these things to games at Valve."
In the MP3 tags of the official Portal 2 soundtrack, Morasky is credited as "Aperture Science Psychoacoustics Laboratory".
- Dopamine (2003) (guitar)
- Day of Defeat: Source (2005)
- One Winter Story (2006)
- Portal (2007) (additional music)
- Team Fortress 2 (2007)
- I Die Daily: The Making of Matthew Barney's 'Cremaster Cycle' (2007)
- Life in Flight (2008) (additional music)
- Left 4 Dead (2008)
- Left 4 Dead 2 (2009)
- Portal 2 (2011)
Visual effects supervisor
- The Lord of the Rings: The Fellowship of the Ring (2001) (lead massive crowd technical director)
- The Lord of the Rings: The Two Towers (2002) (senior massive technical director)
- The Matrix Reloaded (2003) (lead technical director)
- The Matrix Revolutions (2003) (sentinel/swarm lead)
- The Lord of the Rings: The Return of the King (2003) (senior massive technical director)
- Catwoman (2004) (CG supervisor)
- Drawing Restraint 9 (2005) (lead technical director)
- Pirates of the Caribbean: Dead Man's Chest (2006) (digital artist)
- Mike Morasky on Discogs
- Steel Pole Bath Tub's official website
- Midnight Riders' official website
- Portal 2's dynamic music on GamesRadar